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SDL_x11dga.c
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SDL_x11dga.c
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/*
SDL - Simple DirectMedia Layer
Copyright (C) 1997-2006 Sam Lantinga
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Sam Lantinga
slouken@libsdl.org
*/
/* This is currently only used to enable DGA mouse.
The new fullscreen code makes it very difficult to handle DGA dynamically.
There will be a completely separate DGA driver that is fullscreen-only.
*/
#include "SDL_video.h"
#include "SDL_cursor_c.h"
#include "SDL_x11dga_c.h"
/* Global for the error handler */
int dga_event, dga_error = -1;
void X11_EnableDGAMouse(_THIS)
{
#ifdef XFREE86_DGAMOUSE
int dga_major, dga_minor;
int use_dgamouse;
const char *env_use_dgamouse;
/* Check configuration to see if we should use DGA mouse */
#ifdef DEFAULT_DGAMOUSE
use_dgamouse = 1;
#else
use_dgamouse = 0;
#endif
env_use_dgamouse = SDL_getenv("SDL_VIDEO_X11_DGAMOUSE");
if ( env_use_dgamouse ) {
use_dgamouse = atoi(env_use_dgamouse);
}
/* Check for buggy X servers */
if ( use_dgamouse && BUGGY_XFREE86(==, 4000) ) {
use_dgamouse = 0;
}
/* Only use DGA mouse if the cursor is not showing (in relative mode) */
if ( use_dgamouse && local_X11 && !(using_dga & DGA_MOUSE) &&
SDL_NAME(XF86DGAQueryExtension)(SDL_Display, &dga_event, &dga_error) &&
SDL_NAME(XF86DGAQueryVersion)(SDL_Display, &dga_major, &dga_minor) ) {
if ( SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, XF86DGADirectMouse) ) {
using_dga |= DGA_MOUSE;
}
}
#endif /* XFREE86_DGAMOUSE */
}
/* Argh. Glide resets DGA mouse mode when it makes the context current! */
void X11_CheckDGAMouse(_THIS)
{
#ifdef XFREE86_DGAMOUSE
int flags;
if ( using_dga & DGA_MOUSE ) {
SDL_NAME(XF86DGAQueryDirectVideo)(SDL_Display, SDL_Screen, &flags);
if ( ! (flags & XF86DGADirectMouse) ) {
SDL_NAME(XF86DGADirectVideo)(SDL_Display,SDL_Screen,XF86DGADirectMouse);
}
}
#endif
}
void X11_DisableDGAMouse(_THIS)
{
#ifdef XFREE86_DGAMOUSE
if ( using_dga & DGA_MOUSE ) {
SDL_NAME(XF86DGADirectVideo)(SDL_Display, SDL_Screen, 0);
using_dga &= ~DGA_MOUSE;
}
#endif /* XFREE86_DGAMOUSE */
}